A B757 crew verified the FMC flight plan waypoints on the dfw clare 2 RNAV during preflight but afte...

Attributes
ACN	988179
Time
Date	201201
Local Time Of Day	1201-1800
Place
Locale Reference	ZFW.ARTCC
State Reference	TX
Environment
Light	Daylight
Aircraft 1
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Route In Use	SID CLARE 2 RNAV
Flight Plan	IFR
Component
Aircraft Component	FMS/FMC
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Total 18300
Person 2
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Procedural Clearance Deviation - Track / Heading All Types

Narrative:

I read and checked along with first officer the clare two RNAV departure out of dfw; way point by way point along with speed and altitude restrictions and all checked good. First officer flying; 400 ft LNAV; 500 ft autopilot on and I was on the prog page 2 to check for errors on departure. Everything went perfect in the critical phase right after takeoff up to above approximately 20;000 ft where I went to regular prog page. Approximately 3 minutes after crossing clare ATC asked where we were going since we were about a mile off course. I answered that we were going to swb because that's what was in the both FMC's. ATC then said we were supposed to fly poten; then tekbe before going to swb. I was absolutely flabbergasted since we did a very thorough check before we left and first officer clearly remembered that I read poten and tekbe to him when I went through the legs in the FMC. Neither the first officer nor I have any idea why all of a sudden both FMC's had us going to clare and then direct swb. ATC said 'no problem' and recleared us to swb.

Original NASA ASRS Text

Title: A B757 crew verified the FMC flight plan waypoints on the DFW CLARE 2 RNAV during preflight but after takeoff POTEN and TEKBE waypoints dropped out causing a track deviation detected by ATC.

Narrative: I read and checked along with First Officer the CLARE TWO RNAV departure out of DFW; way point by way point along with speed and altitude restrictions and all checked good. First Officer flying; 400 FT LNAV; 500 FT autopilot on and I was on the PROG page 2 to check for errors on departure. Everything went perfect in the critical phase right after takeoff up to above approximately 20;000 FT where I went to regular PROG page. Approximately 3 minutes after crossing CLARE ATC asked where we were going since we were about a mile off course. I answered that we were going to SWB because that's what was in the both FMC's. ATC then said we were supposed to fly POTEN; then TEKBE before going to SWB. I was absolutely flabbergasted since we did a VERY thorough check before we left and First Officer clearly remembered that I read POTEN and TEKBE to him when I went through the legs in the FMC. Neither the First Officer nor I have any idea why all of a sudden both FMC's had us going to CLARE and then direct SWB. ATC said 'no problem' and recleared us to SWB.

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

A B757 crew verified the FMC flight plan waypoints on the dfw clare 2 RNAV during preflight but after takeoff poten and tekbe waypoints dropped out causing a track deviation detected by ATC.